Spin currents and superfluidity of microcavity polaritons

该项目的总体目标是在实验上探测微腔中的激子-极化子超流体和自旋电流，并发展激子-极化子超流的全量子理论。无论有没有外加磁场，在改进的质量无应变微腔样品上，将在具有光谱、时间和偏振探测的空间和方向分辨光学测量中寻找极化激子超流的指纹。我们将在光学自旋霍尔效应的范围内寻找常规和超流极化子的自旋流。我们预计激子-极化子的特殊色散和自旋结构将导致极化子与常规超流体在理论上的重要区别。我们的目标是从理论和实验上研究共振和非共振激发的极化子凝聚体的极化动力学，以揭示极化子超流性的特殊性，并寻找新的效应，包括光学自旋霍尔效应和迈斯纳效应的自旋类比。

The overall goal of the project is to detect experimentally exciton-polariton superfluids and spin currents in microcavities and to develop a full quantum theory of exciton-polariton superfluidity. The fingerprints of polariton superfluidity will be searched for in spatially- and directionally-resolved optical measure-ments with spectral, temporal and polarization-detection, with or without application of external magnetic fields, on improved quality strain free microcavity samples. We shall look for conventional and superfluid polariton spin currents in the regime of the optical spin Hall effect. We expect theoretically important dif-ferences between polariton and conventional superfluids caused by a peculiar dispersion and spin structure of exciton-polaritons. We aim to study theoretically and experimentally the polarization dynamics of both resonantly and non-resonantly excited polariton condensates to reveal the specifics of polariton superfluid-ity and search for new effects including the optical spin-Hall effect and the spin analogue of the Meissner effect.